第一种：
Intent mIntent = new Intent();
mIntent.setClassName(mcureeActivity.this, nextActivity.class);
startActivity(mIntent)
第二种：
Intent mIntent = new Intent();
mIntent.setClassName("com.android.test", "com.android.test.next");
startActivity(mIntent);
第三种：设置可以通过setResult()返回值给nextActivity
Intent mIntent = new Intent(mcureeActivity.this, nextActivity.class);
setResult(NUMBER,mIntent);
mcureeActivity.this.finish();